Consists primarily of correspondence with some printed material, reflecting this educator’s professional career. The papers are arranged chronologically under the following associations and institutions with which Aker was affiliated: Adult Education Association of the U.S.A. (1957-1975), Canadian Association for Adult Education (1964-1970), Florida Adult Education Association (1958-1970), Florida State University (1958-1985), Illinois Adult Education Association (1950s-1960s), National Association for Public School Adult Education (1963-1970), and National Seminar on Adult Education Research (1961-1968). Correspondents whose letters are of significant depth and/or duration include Félix Adam, Sam Roy Allen, Ray Ast, Roger W. Axford, Edgar J. Boone, Alexander N. Charters, James H. Fling, Andrew Hendrickson, Cyril O. Houle, Joseph L. Jacques, Eugene I. Johnson, J.R. Kidd, Malcolm S. Knowles, Burton W. Kreitlow, Huey B. Long, Robert A. Luke, Howard Y. McClusky, Jules Pagano, Robert E. Sharer, Robert E. Snyder, and Wilson B. Thiede.